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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
/* div{
    
        width: 300px;
        height: 300px;
        background: radial-gradient(50px at center,green,blue);
} */
div{
    width: 400px;
height: 480px;
background: linear-gradient(135deg,red,blue)
}
    </style>
</head>
<body>
    <div></div>
</body>
</html>